DRM Video Removal is currently the best software program to quickly and perfectly remove drm legally from music file like WMA, M4V, MP4, WMV, MP3, AAC, etc.
You can go to DRM Removalto get the powerful DRM Remover.

As the music in iTunes is encrypted with DRM, you cannot directly put it on any non-Apple MP3 player. The easiest way is to burn the music to an audio CD and then rip it back to Windows Media Player or a similar program as an MP3. Or you can get some software to help you. I use TuneClone to do this. Though not free, it is very well worth a try.